Round: 44 Ground: Hardcourt outdoor
| ITF Sweden F2 | 2017/05/16 09:35 | Karl Friberg v Jeremy Jahn | 5-7,2-6 |
| ITF Sweden F1 | 2017/05/11 08:15 | Jan Choinski v Karl Friberg | 4-6,6-1,6-4 |
| ITF Sweden F1 | 2017/05/10 08:15 | Karl Friberg v Lucas Renard | 6-2,6-4 |
| ITF Sweden F1 | 2017/05/08 10:30 | Fred Simonsson v Karl Friberg | 4-6,5-7 |
| ITF Croatia F3 | 2017/03/19 08:30 | Karl Friberg v Paul Woerner | 1-6,1-6 |
| ITF Croatia F3 | 2017/03/18 08:00 | Sergey Dorozhkin v Karl Friberg | 3-6,4-6 |
| ITF Sweden F5 | 2016/10/05 14:40 | Alexander Bublik v Karl Friberg | 6-3,1-6,6-3 |
| ITF Sweden F5 | 2016/10/04 12:00 | Christoffer Solberg v Karl Friberg | 4-6,6-2,6-7 |
| Davis Cup | 2017/04/09 09:00 | Mattias Siimar v Lucas Catarina | 4-6,6-4,6-7 |
| Davis Cup | 2017/02/05 08:00 | Lloyd Harris v Mattias Siimar | 7-5,6-3 |
| ITF Egypt F2 | 2017/01/23 08:00 | Libor Salaba v Mattias Siimar | 7-6,6-3 |
| ITF Egypt F2 | 2017/01/22 10:30 | Mattias Siimar v Nicolas Uryson | 6-2,6-7,6-4 |
| ITF Estonia F3 | 2016/11/01 12:05 | Alexander Vasilenko v Mattias Siimar | 6-1,6-3 |
| ITF Estonia F2 | 2016/10/27 14:30 | Kenneth Raisma v Mattias Siimar | 6-1,6-4 |
| ITF Estonia F2 | 2016/10/24 13:00 | Verneri Tuomi v Mattias Siimar | 3-6,0-6 |
| ITF Estonia F1 | 2016/07/26 22:00 | Yann Wojcik v Mattias Siimar | 7-5,7-6 |